Needle bar height positioning of flat buttonhole machine

The height positioning of the needle bar is very important in debugging, and the general debugging work is based on it; whether the height is reasonable is directly related to the quality of the sewing effect and the failure rate; the general method is: install as required Put on the needle, take the left needle position of the left row or the left needle position of the right row, turn the machine by hand to lower the needle bar to the lowest position, and the dimension between the lower end of the needle bar and the plane of the needle plate is about 11.9mm-13.5mm; In the actual debugging work, in order to meet the sewing material category and special product sewing needs, it is the same type of equipment. The height of the needle bar can be appropriately increased or decreased, and the needle bar for elastic and soft sewing materials should be lowered. The material needle bar should be raised, and with the cooperation of the thread hooking mechanism, the sewing effect will be improved: the change of the height and size of the needle bar should be controlled within the standard value of ±1mm.